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I've been building computers for my friends and I for 25 years and the two worst "random stability" issues I had were high quality but aging PSUs.

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Yup. When building "upcycled" PCs out of used second-to-last-gen components, I learned very quickly to only ever use brand-new, high quality PSUs ... the alternative is insanity

My anecdotal experience over the last 15 years of personal PCs.

I've had one case of Corsair memory which went faulty after a year (was replaced without question by the supplier) and around 3 PSU failures.

However, on the 3 times I've done upgrades (typically motherboard + RAM + CPU) in that time I've been able to keep my existing PSU without stability issues.

So I wouldn't say it's "insanity" to keep your current PSU when upgrading, but based on your experience if I had stability issues it may be the first thing I test.

Yea, I've ran bunch of office PC's with nearly 20 year old components 24/7 without any stability issues (acting space heaters doing CPU intensive tasks in winter).

No need to replace a quality PSU until you start having issues.

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